Differential microammeter (CB7362E)

This circuit was obtained in a 1964 Electronic Design. The transistors are from the era and the instrument is 100 uA full-scale.

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Wiper Water Sensor (CB4968E)
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Parallel Port Interface (CB25730E)
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
Volume limiter (CB25287E)
This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit...